- 1 year ago
MEMORY_BASIC_INFORMATION and VirtualQueryEx on different architectures
When using the MEMORY_BASIC_INFORMATION
structure and VirtualQueryEx
function in Windows, it's important to consider the differences between 32-bit and 64-bit architectures.
On a 32-bit system:
- The
MEMORY_BASIC_INFORMATION
structure is defined with 28 bytes in size. - The
VirtualQueryEx
function returns information about a memory region in aMEMORY_BASIC_INFORMATION
structure with the expected size of 28 bytes.
On a 64-bit system:
- The
MEMORY_BASIC_INFORMATION
structure is defined with 48 bytes in size. - The
VirtualQueryEx
function returns information about a memory region in aMEMORY_BASIC_INFORMATION
structure with the size of 48 bytes.
To ensure proper usage of the MEMORY_BASIC_INFORMATION
structure and VirtualQueryEx
function on different architectures, you can take the following steps:
Define the
MEMORY_BASIC_INFORMATION
structure with the appropriate size based on the target architecture. For example:cpp#ifdef _WIN64
typedef struct _MEMORY_BASIC_INFORMATION_64 {
// Define the structure fields for 64-bit architecture
} MEMORY_BASIC_INFORMATION;
#else
typedef struct _MEMORY_BASIC_INFORMATION_32 {
// Define the structure fields for 32-bit architecture
} MEMORY_BASIC_INFORMATION;
#endif
When calling the
VirtualQueryEx
function, use the correct size for theMEMORY_BASIC_INFORMATION
structure based on the architecture. For example:cpp#ifdef _WIN64
MEMORY_BASIC_INFORMATION_64 mbi;
#else
MEMORY_BASIC_INFORMATION_32 mbi;
#endif
SIZE_T result = VirtualQueryEx(processHandle, address, &mbi, sizeof(mbi));
By using conditional compilation and defining the MEMORY_BASIC_INFORMATION
structure and its size based on the target architecture, you can ensure proper compatibility and functionality of your code across different architectures.
It's important to note that the example provided assumes C++ code targeting the Windows platform. Please adapt the code as needed for your specific programming language and environment.